This unit was developed by my neighbors Bo Zimmerman and Carlos Santiago. Bo is working on the QL version firmware with me. He's my secret weapon

Note: this unit is based on the ESP8266, which we have abandoned in favor of the ESP32.

Also note they refuse refunds and they refuse warranty. They are required to offer refunds as a "distance seller". I have alerted Bo Zimmerman (author of the software they're using) and he's sending them a snotty email. I mean, c'mon, if you buy something on the internet and it doesn't work, you have a legal right to return it for a full refund. It's UK law.

Artificer wrote:I agree it looks a bit expensive especially with no returns if non functional.

We reached out to the guy and he's changing his policy. He does full returns and refunds for 14 days.

I'm making a fresh batch of mine. It comes with a QL cable, so, there is that. It also has a DB9 connector, so if/when faster serial comes along with a useful driver it will work with that too. My current "serial port" is a brute force discrete logic parallel<>serial shifter into a 2K FIFO that clocks the data in and out at 1,500,000 bps. It's clunky, and not right for "civilian use" - and also it's expensive, bulky and often trips up, with no handshaking or error detection/correction.